/*
 * TransactionManagerMonitor.java    ver   29/nov/2009
 *
 * Copyright (c) 2009 mentalsmash.org
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * The use of the Apache License does not indicate that this project is
 * affiliated with the Apache Software Foundation.
 */
package org.mentalsmash.tazio.transactions.management;

import javax.management.JMException;
import javax.management.MBeanServer;
import javax.management.ObjectName;

import org.mentalsmash.tazio.commons.timer.TimingsLog;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.inject.Inject;
import com.google.inject.name.Named;

/**
 * Implementation of the MBean {@link TransactionManagerMonitorMBean}
 * 
 * @version 0.0.1 29/nov/2009
 * @author Andrea Reale <andrea.reale@gmail.com>
 * 
 */
public abstract class TransactionManagerMonitor implements
	TransactionManagerMonitorMBean {

    private final static Logger log = LoggerFactory
	    .getLogger(TransactionManagerMonitor.class);

    private final TimingsLog timeLog;
    
    public static final String NAME = "TransactionManagerMonitor";
    
    @SuppressWarnings("unused")
    private final String name;
    
    private final SystemTransactionManager tm;
    
    @Inject
    protected TransactionManagerMonitor(final TimingsLog tlog, @Named(NAME) String name, SystemTransactionManager tm) {
	this.timeLog = tlog;
	this.name = name;
	this.tm = tm;
    }

    public abstract String getKey();

    @Inject
    public void register(final MBeanServer server) {
	try {
	    final ObjectName name = new ObjectName(
		    "org.mentalsmash.tazio.transactions:type="+
		    "TransactionManagerMonitor");
	    server.registerMBean(this, name);
	} catch (final JMException e) {
	    log.error("Unable to register MBean", e);
	}
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * org.mentalsmash.tazio.transactions.management.TransactionManagerMonitorMBean
     * #getAvgCommitTime()
     */
    @Override
    public double getAvgCommitTime() {
	return timeLog.getAvgMeasure(getKey());

    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * org.mentalsmash.tazio.transactions.management.TransactionManagerMonitorMBean
     * #getMaxCommitTime()
     */
    @Override
    public long getMaxCommitTime() {
	return timeLog.getMaxMeasure(getKey());
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * org.mentalsmash.tazio.transactions.management.TransactionManagerMonitorMBean
     * #getMinCommitTime()
     */
    @Override
    public long getMinCommitTime() {
	return timeLog.getMinMeasure(getKey());
    }
    
    @Override
    public double getCommitTimeStdDev() {
	return timeLog.getStdDeviation(getKey());
    }
    
    @Override
    public int getNumLocalRollbacks() {
	return tm.getNumLocalRollbacks();
    }

}
